List of sovereign states in 1931

A

• Afghanistan - Kingdom of Afghanistan
• Albania - Albanian Kingdom
•  Andorra - Principality of Andorra
•  Argentina - Argentine Republic
•  Australia - Commonwealth of Australia (Dominion of the British Empire)
• Austria - Federal State of Austria

B

•  Belgium - Kingdom of Belgium
•  Bolivia - Republic of Bolivia
• Brazil - Republic of the United States of Brazil
•  Bulgaria - Kingdom of Bulgaria

C

•  Canada - Dominion of Canada (Dominion of the British Empire to December 11)
•  Chile - Republic of Chile
•  China - Republic of China
•  Colombia - Republic of Colombia
•  Costa Rica - Republic of Costa Rica
•  Cuba - Republic of Cuba
• Czechoslovakia - Czechoslovak Republic

D

•  Danzig - Free City of Danzig
•  Denmark - Kingdom of Denmark
•  Dominican Republic

E

•  Ecuador - Republic of Ecuador
•  Egypt - Kingdom of Egypt
•  El Salvador - Republic of El Salvador
•  Estonia - Republic of Estonia
•  Ethiopia - Ethiopian Empire

F

•  Finland - Republic of Finland
• France - French Republic

G

•  Germany - German Reich
• Greece - Hellenic Republic
•  Guatemala - Republic of Guatemala

H

•  Haiti - Republic of Haiti
•  Honduras - Republic of Honduras
• Hungary - Kingdom of Hungary

I

• Iceland - Kingdom of Iceland
•  Ireland - Irish Free State (Dominion of the British Empire to December 11)
•  Italy - Kingdom of Italy

J

•  Japan - Empire of Japan

L

•  Latvia - Republic of Latvia
•  Liberia - Republic of Liberia
•  Liechtenstein - Principality of Liechtenstein
• Lithuania - Republic of Lithuania
•  Luxembourg - Grand Duchy of Luxembourg

M

•  Mexico - United Mexican States
•  Monaco - Principality of Monaco
• Mongolia - Mongolian People's Republic

N

• Nejd and Hejaz - Kingdom of Nejd and Hejaz (Personal Union)
  • Nejd - Kingdom of Nejd and its Dependencies
  • Hejaz - Kingdom of Hejaz
• Nepal - Kingdom of Nepal
•  Netherlands - Kingdom of the Netherlands
• Newfoundland - Dominion of Newfoundland (Dominion of the British Empire)
• New Zealand - Dominion of New Zealand (Dominion of the British Empire)
•  Nicaragua - Republic of Nicaragua
•  Norway - Kingdom of Norway

P

•  Panama - Republic of Panama
•  Paraguay - Republic of Paraguay
• Persia - Imperial State of Persia
•  Peru - Peruvian Republic
• Poland - Republic of Poland
• Portugal - Portuguese Republic

R

•  Romania - Kingdom of Romania

S

•  San Marino - Most Serene Republic of San Marino
•  Siam - Kingdom of Siam
•  South Africa - Union of South Africa (Dominion of the British Empire to December 11)
•  Soviet Union - Union of Soviet Socialist Republics
•  Spain
  • Kingdom of Spain (to April 14)
  • Spanish Republic (from April 14)
•  Sweden - Kingdom of Sweden
•   Switzerland - Swiss Confederation

T

•  Turkey - Republic of Turkey

U

•  United Kingdom - United Kingdom of Great Britain and Northern Ireland
•  United States - United States of America
•  Uruguay - Eastern Republic of Uruguay

V

•   Vatican City - Vatican City State
•  Venezuela - United States of Venezuela

Y

• Yemen - Mutawakkilite Kingdom of Yemen
•  Yugoslavia - Kingdom of Yugoslavia

Australia

• Norfolk Island - Territory of Norfolk Island (External territory)
•  Papua - Territory of Papua (External territory)

Belgium

•  Belgian Congo (Colony)
• Tientsin (Concession, to January 15)

Condominiums

• Anglo-Egyptian Sudan (Anglo-Egyptian condominium)
•  New Hebrides (Anglo-French condominium)

Denmark

• Greenland (Possession)

France

• Adélie Land (Uninhabited possession)
• Clipperton Island (Uninhabited possession, from January 28)
•  French Equatorial Africa (Colony)
• French Guiana (Colony)
• French India - French Establishments in India (Colony)
•  French Indochina (Federation of protectorates)
• French Oceania - French Establishments in Oceania (Colony)
•  French Somaliland (Colony)
•  French West Africa (Colony)
• Guadeloupe (Colony)
• Inini (Colony)
• Madagascar (Colony)
• Martinique (Colony)
•  Morocco - Sultanate of Morocco (de jure sovereign state under French and Spanish protectorate)^[1][2]
•  New Caledonia - New Caledonia and Dependencies (Colony)
• Réunion (Colony)
•  Saint Pierre and Miquelon (Colony)
• Shanghai (Concession)
• Tientsin (Concession)
• Tunisia - Tunisian Realm (Protectorate)

International

• Saar - Territory of the Saar Basin (International territory under League of Nations supervision)
• Shanghai - Shanghai International Settlement (International concession)
• Tangier - City of Tangier (Moroccan city under International administration)

Italy

• Eritrea (Colony)
• Italian Cyrenaica (Colony)
• Italian Somaliland (Colony)
• Italian Tripolitania (Colony)
• Tientsin (Concession)

Japan

• Chōsen (Dependency)
• Karafuto - Karafuto Prefecture (Dependency)
• Kwantung - Kwantung Leased Territory (Concession)
• Taiwan (Dependency)
• Tientsin (Concession)

League of Nations Mandates

• British Cameroons (administered by the United Kingdom)
• British Togoland (Administered by the United Kingdom)
• French Cameroons (administered by France)
• French Togoland (Administered by France)
• Nauru (Administered by Australia, New Zealand and the United Kingdom)
• New Guinea - Territory of New Guinea (Administered by Australia)
•  Palestine (Administered by the United Kingdom)
  • Transjordan - Emirate of Transjordan (Administered by the United Kingdom)
• Ruanda-Urundi (Administered by Belgium)
• South Pacific Mandate (Administered by Japan)
• South-West Africa (Administered by South Africa)
• Syria and Lebanon (Administered by France)
  • Jabal ad-Druze - Jabal ad-Druze State (Administered by France)
  • Latakia - Sanjak of Latakia (Administered by France)
  • Lebanon - Lebanese Republic (Administered by France)
  • Syria - Syrian Republic (Administered by France)
• Tanganyika - Tanganyika Territory (Administered by the United Kingdom)
•  Western Samoa (Administered by New Zealand)

Not enacted

• Mesopotamia - Kingdom of Iraq (Administered by the United Kingdom)

Mexico

• Isla de la Pasión (Uninhabited territory, to January 28)

Netherlands

• Curaçao and Dependencies (Colony)
• Dutch East Indies (Colony)
• Surinam (Colony)

New Zealand

• Cook Islands (Dependent territory)
• Niue Island (Dependent territory)
• Ross Dependency (Uninhabited dependent territory)
• Union Islands (Dependent territory)

Norway

• Bouvet Island (Uninhabited possession)
• Eric the Red's Land (Uninhabited possession, from July 10)
• Peter I Island (Uninhabited possession)

Portugal

•  Portuguese Cape Verde (Colony)
• Macau (Colony)
• Portuguese East Africa (Colony)
•  Portuguese Guinea (Colony)
• Portuguese India - Portuguese State of India (Colony)
•  Portuguese Timor (Colony)
• Portuguese West Africa (Colony)
• São João Baptista de Ajudá - Fort of São João Baptista de Ajudá (Possession)
• São Tomé and Príncipe (Colony)

Spain

• Ifni (Colony)
•  Spanish Guinea (Colony)
•  Morocco - Sultanate of Morocco (de jure sovereign state under French and Spanish protectorate)^[1][2]
•  Spanish Sahara (Colony)

United Kingdom

•  Bahama Islands (Crown colony)
• Bahrain - State of Bahrain (Protectorate)
• Baker Island (Uninhabited possession)
•  Barbados (Crown colony)
• Basutoland - Territory of Basutoland (Crown colony)
• Bechuanaland - Bechuanaland Protectorate (Protectorate)
• Bermuda (Crown colony)
•   Bhutan - Kingdom of Bhutan (Independent state under Treaty of Punakha)
•  British Guiana (Crown colony)
•  British Honduras (Crown colony)
• British Leeward Islands - Federal Colony of the Leeward Islands (Crown colony)
• British Somaliland - British Somaliland Protectorate (Protectorate)
• British Western Pacific Territories (Crown colony)
• British Windward Islands - Federal Colony of the Windward Islands (Crown colony)
• Brunei - State of Brunei (Protectorate)
•  Ceylon (Crown colony)
• Cyprus (Crown colony)
• Enderby Land (Uninhabited possession)
• Falkland Islands (Crown colony)
• Federated Malay States (Protectorate)
• Gambia - Gambia Colony and Protectorate (Crown colony and protectorate)
•  Gibraltar (Crown colony)
•  Gold Coast (Crown colony)
• Guernsey - Bailiwick of Guernsey (Crown dependency)
• Heard Island and McDonald Islands (Uninhabited possession)
• Hong Kong (Crown colony)
•  India - Indian Empire (Crown colony)
• Isle of Man (Crown dependency)
•  Jamaica (Crown colony)
• Jarvis Island (Uninhabited possession)
•  Jersey - Bailiwick of Jersey (Crown dependency)
•  Johor - State of Johor Darul Ta'zim (Protectorate)
•  Kedah - State of Kedah Darul Aman (Protectorate)
•  Kelantan - State of Kelantan Darul Naim (Protectorate)
•  Kenya - Kenya Colony and Protectorate (Crown colony and protectorate)
•  Kuwait - State of Kuwait (Protectorate)
• Maldive Islands - Sultanate of the Maldive Islands (Protectorate)
•  Malta (Crown colony)
•  Mauritius (Crown colony)
• Muscat and Oman - Sultanate of Muscat and Oman (State under the informal protection)
•  Nigeria - Colony and Protectorate of Nigeria (Crown colony and protectorate)
•  North Borneo (Protectorate)
• Northern Rhodesia - Protectorate of Northern Rhodesia (Protectorate)
•  Nyasaland - Nyasaland Protectorate (Protectorate)
•  Perlis - State of Perlis Indera Kayangan (Protectorate)
• Qatar - State of Qatar (Protectorate)
• Saint Helena (Crown colony)
• Sarawak - Kingdom of Sarawak (Protectorate)
• Seychelles (Crown colony)
• Sierra Leone - Sierra Leone Colony and Protectorate (Crown colony and protectorate)
•  Southern Rhodesia - Colony of Southern Rhodesia (Crown colony)
•  Straits Settlements (Crown colony)
• Swaziland - Swaziland Protectorate (Protectorate)
• Terengganu - State of Terengganu Darul Iman (Protectorate)
•  Trinidad and Tobago (Crown colony)
• Tristan da Cunha (Crown colony)
• Trucial States (Protectorate)
•  Uganda (Crown colony)
• Victoria Land (Uninhabited possession)
• Zanzibar - Sultanate of Zanzibar (Protectorate)

United States

• Alaska - Alaska Territory (Territory)
• American Samoa - Territory of American Samoa (Territory)
• Bajo Nuevo Bank (Uninhabited territory)
• Guam - Territory of Guam (Territory)
• Hawaii - Territory of Hawaii (Territory)
• Howland Island (Uninhabited territory)
• Johnston Atoll (Uninhabited territory)
• Kingman Reef (Uninhabited territory)
• Midway Atoll (Uninhabited territory)
• Navassa Island (Uninhabited territory)
•  Panama Canal Zone (Territory)
• Philippine Islands (Territory)
• Puerto Rico (Territory)
• Quita Sueño Bank (Uninhabited territory)
• Roncador Bank (Uninhabited territory)
• Serrana Bank (Uninhabited territory)
• Serranilla Bank (Uninhabited territory)
• Swan Islands (Uninhabited territory)
•  United States Virgin Islands (Territory)
• Wake Island (Uninhabited territory)